R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 Subtask 21-52-24-865-052
 E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

R (1) FOR 10HM4
 (a) 1HH, 2HH, 3HH, 4HH, R (2) FOR 11HM4
 (a) 21HH, 22HH, 23HH, 24HH.

R  **ON A/C 401-499,
 Subtask 21-52-24-865-052-A
 E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 
R  (1) FOR 10HM4
 (a) 49HH, 50HH, 51HH, 52HH, 
R  (2) FOR 11HM4
 (a) 53HH, 54HH, 55HH, 56HH.
 **ON A/C ALL
 Subtask 21-52-24-710-050
 F. Test
 (1) Do the pre-conditioning through the HP ground connector (Ref. TASK 12-33-21-618-001) or with the APU (Ref. TASK 12-33-21-618-001).
 (2) Do a leak check of the heat exchanger unit connections.
 NOTE : Minimum leakage is permitted. After the pack operates some____ minutes, the leakage of air will reduce because the seals have their correct operating temperature.
 (3) After approx. 15 minutes stop the pre-conditioning (Ref. TASK 12-33-21-618-001) or (Ref. TASK 12-33-21-618-001).
 (4) Do the operational test of the cockpit and cabin temperature control (Ref. TASK 21-63-00-710-004). 

R 1EFF : ALL 1 21-52-24Page 443 1 1 Aug 01/05 1 1 1CES 1

 5. Close-up
________ Subtask 21-52-24-410-051
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel (Ref. TASK 53-35-13-400-002)
 FOR 10HM4
 191KB,
 FOR 11HM4
 192KB.

 (3) Remove the warning notice(s). Subtask 21-52-24-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
R 1EFF : ALL 1 21-52-24Page 444 1 1 Aug 01/05 1 1 1CES 1

 TASK 21-52-24-000-001- 01
 Removal of the Heat Exchanger Unit 10HM4 (11HM4) (From the Air Conditioning Pack)
 NOTE : The procedure is the same for the heat exchanger unit 10HM4 and 11HM4.____
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  blanking plugs
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-52-23-000-001 21-52-41-000-001 53-35-13-000-002 CMM 215200  Removal of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle MachineRemoval of the Air Conditioning Pack 10HM (11HM)Removal of the Quick-Release Access Panels from the Belly Fairing Structure
R  **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 21-52-24-991-001  Fig. 401 
R  **ON A/C 151-199, 401-499, 
R R  21-52-24-991-001-A  Fig. 401A 

R 1EFF : ALL 1 21-52-24Page 445 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL
 3. Job Set-up__________
 Subtask 21-52-24-010-052
 A. Get Access
 (1) Remove the access panel/s (Ref. TASK 53-35-13-000-002).
 (a) FOR 10HM4 - 191KB;
 (b) FOR 11HM4 - 192KB.
 4. Procedure_________
 Subtask 21-52-24-020-052
 A. Removal of the Heat Exchanger Unit 
R  **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 401/TASK 21-52-24-991-001) 
R  **ON A/C 151-199, 401-499, 
R R (Ref. Fig. 401A/TASK 21-52-24-991-001-A) 
**ON A/C ALL
 NOTE : Turn the sleeves (16), (88) and (59) when you move them or when____ you remove them. This will help to prevent damage to the internal seals.
 (1) Remove the air conditioning pack (Ref. TASK 21-52-41-000-001).
 NOTE : Make sure that the air conditioning pack is securely fastened____ in the correct support stand (Ref. CMM 215200) before you remove any of the pack components. 

R 1EFF : ALL 1 21-52-24Page 446 1 1 Aug 01/05 1 1 1CES 1 Damage to the individual components could occur if it is not correctly supported.

 (2)
 Remove the pipe assembly (Ref. TASK 21-52-23-000-001).

 (3)
 Remove the clamp (9) and the sleeve (8).

 (4)
 Remove the nut (45), the washer (44), the bonding strap (41) and the screw (42).
　
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